BUY DS1302S https://www.utsource.net/itm/p/11667622.html
IC RTC CLK/CALENDAR SER 8-SOIC
Description: The DS1302S is a Real-Time Clock (RTC) IC from Maxim Integrated. It is a low-power, full binary-coded decimal (BCD) clock/calendar plus 56 bytes of NV SRAM. Features: Low-power consumption Real-time clock/calendar 56 bytes of NV SRAM Operating voltage range: 2.0V to 5.5V Operating temperature range: -40°C to +85°C Package: 8-pin SOIC (SOP8) Applications: Data logging Time stamping Timing applications Automotive applications Industrial applications (For reference only)